一维单原子链
one-dimensional monatomic lattice
one-demensional mono-atomic chain
包围维管束
concentric vascular bundle
并立维管束
collateral vascular bundle
collateral bundle
并生维管束
collateral vascular bundle
collateral bundle
垂直维管束柔细胞
Longitudinal strand parenchyma
大维管束效率
Large vascular bundles efficiency